We know to use pathauto module in drupal to make URL friendly but the default file i18n-ascii.txt not support Vietnamese characters.

For sample , your title "Tường thuật trực tiếp giải bóng đá Tây Ban Nha Villarreal gặp Barcelona" would be :

t%C6%B0%E1%BB%9Dng-thu%E1%BA%ADt-tr%E1%BB%B1c-ti%E1.....

but if you Vietnamese filter :

tuong-thuat-truc-tiep-giai-bong-da-tay-ban-nha-villarreal-gap-barcelona

Very nice , huh?

Drupal multi-site has the advantage of using one codebase for multiple websites and therefore enabling an administrator to centrally maintain and upgrade the code while serving similar or different content to different website on different domains.